{"product_id":"spiropure-sp-bp-420-1-1-micron-4-bag-filter-high-dirt-capacity","title":"SpiroPure SP-BP-420-1 1 Micron #4 Bag Filter - High Dirt Capacity","description":"\u003cp\u003eIn this review the SpiroPure SP-BP-420-1 (1 micron, #4) liquid bag filter is evaluated for industrial filtration tasks where chemical compatibility and high dirt-holding capacity matter. The reviewer found it most valuable for process lines handling corrosive fluids, oils, and solvent streams because the glazed polypropylene felt media balances fine particle capture with long service life. For facilities that run standard-sized housings and need consistent 1 micron nominal filtration in a bulk supply, this case of 40 offers convenience and predictable performance.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlazed polypropylene felt media:\u003c\/strong\u003e Provides chemical resistance suitable for acids, alkalis, oils, and many organic solvents while maintaining structural integrity during flow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh dirt-holding capacity:\u003c\/strong\u003e Extends run time between changeouts on heavy-loading or abrasive service, reducing maintenance interruptions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e#4 size compatibility:\u003c\/strong\u003e Designed to fit standard #4 filter housings (4 in x 15 in) for straightforward replacement in existing systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal 1 micron rating:\u003c\/strong\u003e Captures fine particulate for critical applications where sub-10 micron removal improves downstream processes or protects equipment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCase quantity of 40:\u003c\/strong\u003e Suits facilities that prefer stocking multiple bag changes and simplifies inventory management for routine maintenance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30-day money back guarantee:\u003c\/strong\u003e Offers a short-term return option for buyers who need to validate fit and performance in their specific process.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe SP-BP-420-1 is best for industrial operators, chemical processors, and maintenance teams running filter housings that accept #4 bags and require a nominal \u003cstrong\u003e1 micron\u003c\/strong\u003e level of filtration. It fits plants treating corrosive fluids, oil-based streams, or solvent-bearing liquids where polypropylene compatibility and high dirt capacity are priorities.\u003c\/p\u003e\n\u003cp\u003eIt is less appropriate for users who need absolute-rated filters, very high temperature polymer-resistant media beyond PP compatibility, or nonstandard bag sizes. Laboratories or specialty processes demanding certified absolute efficiency should consider other media types designed for precise particle-count guarantees.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGood chemical compatibility with common acids, alkalis, oils, and solvents thanks to glazed PP felt.\u003c\/li\u003e\n\u003cli\u003eHigh dirt-holding capacity reduces frequency of bag changes in heavy-loading services.\u003c\/li\u003e\n\u003cli\u003eStandard #4 dimensions (4 in x 15 in) ensure easy swap-in for existing housings.\u003c\/li\u003e\n\u003cli\u003eBulk case of 40 aids operations with frequent replacements or multiple filter stations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNominal rather than absolute 1 micron rating means particle retention varies with load and may not meet strict absolute-efficiency requirements.\u003c\/li\u003e\n\u003cli\u003ePolypropylene media has temperature and solvent limits compared with specialty high-temperature or PTFE materials.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSpiroPure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eSP-BP-420-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMicron rating\u003c\/td\u003e\n\u003ctd\u003eNominal 1 micron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e#4 (4 in x 15 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMedia\u003c\/td\u003e\n\u003ctd\u003eGlazed polypropylene felt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuantity\u003c\/td\u003e\n\u003ctd\u003eCase of 40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplications\u003c\/td\u003e\n\u003ctd\u003eCorrosive fluids, oils, alkalis, organic solvents\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe SpiroPure SP-BP-420-1 #4 bag filter is a practical choice for industrial users who need a reliable, chemically compatible \u003cstrong\u003e1 micron\u003c\/strong\u003e nominal filter with strong dirt-holding capacity. It represents good value for plants that run standard housings and want to minimize downtime with bulk supplies, while buyers needing absolute-rated filtration or extreme temperature resistance should evaluate alternative media.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill this bag fit my existing #4 housing?\u003c\/strong\u003e\u003cbr\u003eThe bag is manufactured to standard #4 dimensions (4 in x 15 in) and is intended to fit standard-sized housings; verify your housing accepts #4 bags before ordering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the 1 micron rating absolute?\u003c\/strong\u003e\u003cbr\u003eThis product is a nominal 1 micron filter, so retention varies with particle shape and loading and is not the same as an absolute-rated cartridge.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it handle corrosive liquids?\u003c\/strong\u003e\u003cbr\u003eYes, the glazed polypropylene felt media is suitable for many acids, alkalis, oils, and organic solvents, but check compatibility for specific chemicals and temperatures.\u003c\/p\u003e","brand":"SpiroPure","offers":[{"title":"Default Title","offer_id":48249374114011,"sku":"B08548LMZX","price":154.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81BmQefVPxL._SL1500.jpg?v=1771059977","url":"https:\/\/gearmusthave.com\/products\/spiropure-sp-bp-420-1-1-micron-4-bag-filter-high-dirt-capacity","provider":"GearMustHave","version":"1.0","type":"link"}